15138943 has 4 divisors (see below), whose sum is σ = 15627328. Its totient is φ = 14650560.

The previous prime is 15138941. The next prime is 15138971. The reversal of 15138943 is 34983151.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34983151 = 7 ⋅4997593.

It is a cyclic number.

It is not a de Polignac number, because 15138943 - 2¹ = 15138941 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 15138899 and 15138908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15138941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 244146 + ... + 244207.

It is an arithmetic number, because the mean of its divisors is an integer number (3906832).

Almost surely, 2^15138943 is an apocalyptic number.

15138943 is a deficient number, since it is larger than the sum of its proper divisors (488385).

15138943 is an equidigital number, since it uses as much as digits as its factorization.

15138943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488384.

The product of its digits is 12960, while the sum is 34.

The square root of 15138943 is about 3890.8794635660. The cubic root of 15138943 is about 247.3803414371.

The spelling of 15138943 in words is "fifteen million, one hundred thirty-eight thousand, nine hundred forty-three".